#!/usr/bin/python3


print ('扬成请我吃猪脚饭')
PI = 3.14156
class Circle():
    
    def __init__(self,radius):
        self.radius=radius
    
    @property
    def perimeter(self):
        return 2*PI*radius
    
    @property
    def area(self):
        return PI*self.radius**2

def main():
    radius = float(input('输入半径:'))
    c1,c2 = Circle(radius),Circle(radius+3)
    print(f'游泳池的过道造价是:{c1.area*35.5}元')
    print(f'游泳池的围墙造价是:{(c2.area-c1.area)*28.5}元')
if __name__=='__main__': 
    main()

